Examples

In this section we demonstrate some common auditory signals you may wish to generate.

The examples below all begin with the following imports and default settings.

using AuditoryStimuli, Unitful, Plots
using Random; Random.seed!(0)

sample_rate = 48000
audio_channels = 2;

Bandpass noise signal

noise_source = CorrelatedNoiseSource(Float64, sample_rate, audio_channels, 0.3, 0.8)
correlated_noise = read(noise_source, 1.6u"s")
filtered_noise = bandpass_filter(correlated_noise, 300u"Hz", 700u"Hz")
sound_signal = set_RMS(amplitude_modulate(filtered_noise, 10u"Hz"), 0.2)
PlotSpectroTemporal(sound_signal, time_limits = [1.2, 1.5], figure_size=(800, 400))

Noise with ITD

noise_source = CorrelatedNoiseSource(Float64, sample_rate, audio_channels, 0.3, 0.8)
correlated_noise = read(noise_source, 1.5u"s")
filtered_noise = bandpass_filter(correlated_noise, 300u"Hz", 700u"Hz")
modulated_noise = amplitude_modulate(filtered_noise, 40u"Hz")
it = set_ITD(modulated_noise, -24)

time = 1:size(it, 1); time = time ./ sample_rate
a = plot(time, it, lab = "", xlab = "Time (s)", ylab = "Amplitude", xlims = (0.0, 0.5))
b = plot(time, it, lab = map(string,[:Left :Right]), xlab = "Time (s)", ylab = "", xlims = (0.025, 0.05))
plot(a, b, size = (800, 300))

Harmonic Complex

source = HarmonicComplex(Float64, 48000, collect(200:200:2400))
sound = read(source, 6u"s")
sound = amplitude_modulate(sound, 15u"Hz")
sound = set_RMS(sound, 0.1)
PlotSpectroTemporal(sound, frequency_limits = [0, 3000], time_limits = [0.135, 0.33], amplitude_limits = [-0.6, 0.6], figure_size=(800, 400))